FLASH

AS29F040

Micross Components reserves the right to change products or specifications without notice.

9

AS29F040

Rev. 2.3 01/10

After an erase-suspended program operation is com-

plete, the system can once again read array data within

non-suspended sectors. The system can determine the status of

the program operation using the DQ7 or DQ6 status bits, just

as in the standard program operation. See “Write Operation

Status” for more information.

The system may also write the autoselect command

se-

quence when the device is in the Erase Suspend mode. The

device allows reading autoselect codes even at addresses within

erasing sectors, since the codes are not stored in the memory

array. When the device exits the autoselect mode, the device

reverts to the Erase Suspend mode, and is ready for another

valid operation. See “Autoselect Command Sequence” for

more information.

The system must write the Erase Resume command

(address bits are “don’t care”) to exit the erase suspend mode

and continue the sector erase operation. Further writes of the

Resume command are ignored. Another Erase Suspend

com-

mand can be written after the device has resumed erasing.

TABLE 4: Command Definitions

LEGEND:

X = Don’t Care.

RA = Address of the memory location to be read.

RD = Data read from location RA during read operation.

PA = Address of the memory location to be programmed. Addresses latch on the falling edge of the WE\ or CE\ pulse, whichever happens later.

PD = Data to be programmed at location PA. Data latches on the rising edge of WE\ or CE\ pulse, whichever happens first.

SA = Address of the sector to be verified (in autoselect mode) or erased. Address bits A18-A16 uniquely select any sector.

NOTES:

1. See Table 1 for description of bus operations.

2. All values are in hexadecimal.

3. Except when reading array or autoselect data, all command bus cycles are write operations.

4. Address bits A18 - A11 are don’t care for unlock and command cycles, unless SA or PA required.

5. No unlock or command cycles required when reading array data.

6. The Reset command is required to return to reading array data when device is in the autoselect mode, or if DQ5 goes high (while the device is providing

status data).

7. The fourth cycle of the autoselect command sequence is a read cycle.

8. The data is 00h for an unprotected sector and 01h for a protected sector. See “Autoselect Command Sequence” for more information.

9. The system may read and program in non-erasing sectors, or enter the autoselect mode, when in the Erase Suspend mode. The Erase Suspend command is

valid only during a sector erase operation.

10. The Erase Resume command is valid only during the Erase Suspend mode.

Addr Data

Addr Data

Addr Data

Addr Data

Addr Data

Addr Data

1RA

RD

1

XXX

F0

Manufacturer ID

4

555

AA

2AA

55

555

90

X00

01

Device ID

4

555

AA

2AA

55

555

90

X01

A4

00

01

4

555

AA

2AA

55

555

A0

PA

PD

6

555

AA

2AA

55

555

80

555

AA

2AA

55

555

10

6

555

AA

2AA

55

555

80

555

AA

2AA

55

SA

30

1

XXX

B0

1

XXX

30

Command Sequence

1

Bus Cycles

2,3,4

First

Second

Third

Fourth

Fifth

Sixth

Erase Resume

10

Read

5

Sector Protect Verify

8

Program

Chip Erase

Sector Erase

Erase Suspend

9

Reset

6

Autoselect

7

4

555

AA

2AA

55

555

90

SA

X02